* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #fff;
}

.nav {
  width: 100vw;
  height: 70px;
  padding: 0 45px;
  background-color: #222327;
  position: relative;
  display: flex;
}

.nav li {
  width: 70px;
  height: 70px;
  z-index: 1;
  position: relative;
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.nav li i {
  display: block;
  height: 70px;
  line-height: 70px;
  font-size: 24px;
  text-align: center;
  position: relative;
  transition: all 0.5s;
}

.nav li span {
  position: absolute;
  font-size: 12px;
  letter-spacing: 2px;
  transition: all .5s;
  opacity: 0;
  transform: translateY(20px);
}

.nav li.active i {
  transform: translateY(-35px);
  color: #222327;
}

.nav li.active span {
  opacity: 1;
  transform: translateY(10px);
}

.indicator {
  position: absolute;
  top: -50%;
  width: 70px;
  height: 70px;
  background: #2196f3;
  border-radius: 50%;
  transition: all .5s;
  border: 6px solid rgba(255, 255, 255, 0.5);
}

.indicator::before {
  content: '';
  position: absolute;
  top: 50%;
  left: -22px;
  width: 20px;
  height: 20px;
  background-color: orange;
  border-top-right-radius: 20px;
  box-shadow: 1px -10px 0 0 #fff;
  opacity: 0;
}

.indicator::after {
  content: '';
  position: absolute;
  top: 50%;
  right: -22px;
  width: 20px;
  height: 20px;
  background-color: orange;
  border-top-left-radius: 20px;
  box-shadow: -1px -10px 0 0 #fff;
  opacity: 0;
}

.indicator::before {
  background-color: #222327;
}

.indicator::after {
  background-color: #222327;
}

li:nth-child(1).active ~ .indicator {
  transform: translateX(calc(70px * 0));
}

li:nth-child(2).active ~ .indicator {
  transform: translateX(calc(70px * 1));
}

li:nth-child(3).active ~ .indicator {
  transform: translateX(calc(70px * 2));
}

li:nth-child(4).active ~ .indicator {
  transform: translateX(calc(70px * 3));
}
